220 6919 article Path: news.gmane.org!not-for-mail From: =?ISO-8859-1?Q?Daniel_Kr=FCgler?= Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Compressing Optional Date: Thu, 3 Oct 2013 13:10:56 +0200 Lines: 27 Approved: news@gmane.org Message-ID: References: <9a40a660-b48b-49b7-9d39-85810a55ebcf@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-2 Content-Transfer-Encoding: quoted-printable X-Trace: ger.gmane.org 1380798656 6089 80.91.229.3 (3 Oct 2013 11:10:56 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 3 Oct 2013 11:10:56 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCT7RVFA4QORBQFBWWJAKGQER4BWB4A@isocpp.org Thu Oct 03 13:11:00 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wi0-f200.google.com ([209.85.212.200]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1VRgo6-0007vw-6R for gclcip-std-proposals@m.gmane.org; Thu, 03 Oct 2013 13:10:58 +0200 Original-Received: by mail-wi0-f200.google.com with SMTP id hn9sf2761710wib.3 for ; Thu, 03 Oct 2013 04:10:57 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :x-original-sender:x-original-authentication-results:reply-to :precedence:mailing-list:list-id:list-post:list-help:list-archive :list-subscribe:list-unsubscribe:content-type :content-transfer-encoding; bh=4N6Nb4SuTY00/prTKbmAunMd4m9NZ4KBNDuEfBM5PBs=; b=asuT/xEtXYVnoFNdsK/qsSI+6w5Hgw2WEuc+jFMAeYzh3B+zy9UAvsnQW46UNS1dX+ nPws8G4PVpLWoSG0p67pb1QikjKMr4JgpYUrDbrYNGmw38BbVnHpr+7oBKPQPq9g0d9Z TdJPK9VdNgB1RI6quAdBB/CjLj+nTbgAf4D/kxZ8NJxdBKZt3q1xbGiXngmxHFUTICX3 4hkg+5JRfOmTxUISfr69pYlgQ5zHo8fCO1Bme6oFSfKUSdfObIME4ASu6nL5ZxL4xfjE S5MMZk6Vl7Ke1wbInm9JYdu3eDT47d+4WBSd5P9rFnwkN/pNuiSIM95sHLxxTmy1rH2v Cb/g== X-Received: by 10.180.109.19 with SMTP id ho19mr928949wib.7.1380798657704; Thu, 03 Oct 2013 04:10:57 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.180.37.209 with SMTP id a17ls87691wik.40.canary; Thu, 03 Oct 2013 04:10:56 -0700 (PDT) X-Received: by 10.194.170.133 with SMTP id am5mr6737473wjc.42.1380798656495; Thu, 03 Oct 2013 04:10:56 -0700 (PDT) Original-Received: from mail-we0-x233.google.com (mail-we0-x233.google.com [2a00:1450:400c:c03::233]) by mx.google.com with ESMTPS id gd9si2733980wic.69.1969.12.31.16.00.00 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 03 Oct 2013 04:10:56 -0700 (PDT) Received-SPF: pass (google.com: domain of daniel.kruegler@gmail.com designates 2a00:1450:400c:c03::233 as permitted sender) client-ip=2a00:1450:400c:c03::233; Original-Received: by mail-we0-f179.google.com with SMTP id x55so2426763wes.24 for ; Thu, 03 Oct 2013 04:10:56 -0700 (PDT) X-Received: by 10.180.189.9 with SMTP id ge9mr1961409wic.52.1380798656392; Thu, 03 Oct 2013 04:10:56 -0700 (PDT) Original-Received: by 10.216.153.8 with HTTP; Thu, 3 Oct 2013 04:10:56 -0700 (PDT) In-Reply-To: <9a40a660-b48b-49b7-9d39-85810a55ebcf@isocpp.org> X-Original-Sender: daniel.kruegler@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of daniel.kruegler@gmail.com designates 2a00:1450:400c:c03::233 as permitted sender) smtp.mail=daniel.kruegler@gmail.com; dkim=pass header.i=@gmail.com; dmarc=pass (p=NONE dis=NONE) header.from=gmail.com Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:6919 Archived-At: 2013/10/2 Andrzej Krzemie=F1ski : > template > struct optional_optimized_disengaged_state_traits > { > constexpr static bool is_optimized =3D true; > constexpr static raw_storage_of_size const& value() { > return cast( (T*)1 ); > } > }; Note that this function could not be used in constant expressions, because the (implied) use of reinterpret_cast is not valid in this context. - Daniel --=20 ---=20 You received this message because you are subscribed to the Google Groups "= ISO C++ Standard - Future Proposals" group. To unsubscribe from this group and stop receiving emails from it, send an e= mail to std-proposals+unsubscribe@isocpp.org. To post to this group, send email to std-proposals@isocpp.org. Visit this group at http://groups.google.com/a/isocpp.org/group/std-proposa= ls/. .